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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:46:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:39 -0800
commit9180706344487700b40da9eca5dedd3d11cb33b4 (patch)
treeeb0347efe7e40adc78a271752c7382aa67875d6a /mm/swap.c
parente9da73d67729b58bba256123e2b4651e0d8a01ac (diff)
thp: alter compound get_page/put_page
Alter compound get_page/put_page to keep references on subpages too, in order to allow __split_huge_page_refcount to split an hugepage even while subpages have been pinned by one of the get_user_pages() variants. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c90
1 files changed, 83 insertions, 7 deletions
diff --git a/mm/swap.c b/mm/swap.c
index 3f4854205b1..33f5292fe13 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -56,17 +56,93 @@ static void __page_cache_release(struct page *page)
del_page_from_lru(zone, page);
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
+}
+
+static void __put_single_page(struct page *page)
+{
+ __page_cache_release(page);
free_hot_cold_page(page, 0);
}
-static void put_compound_page(struct page *page)
+static void __put_compound_page(struct page *page)
{
- page = compound_head(page);
- if (put_page_testzero(page)) {
- compound_page_dtor *dtor;
+ compound_page_dtor *dtor;
+
+ __page_cache_release(page);
+ dtor = get_compound_page_dtor(page);
+ (*dtor)(page);
+}
- dtor = get_compound_page_dtor(page);
- (*dtor)(page);
+static void put_compound_page(struct page *page)
+{
+ if (unlikely(PageTail(page))) {
+ /* __split_huge_page_refcount can run under us */
+ struct page *page_head = page->first_page;
+ smp_rmb();
+ /*
+ * If PageTail is still set after smp_rmb() we can be sure
+ * that the page->first_page we read wasn't a dangling pointer.
+ * See __split_huge_page_refcount() smp_wmb().
+ */
+ if (likely(PageTail(page) && get_page_unless_zero(page_head))) {
+ unsigned long flags;
+ /*
+ * Verify that our page_head wasn't converted
+ * to a a regular page before we got a
+ * reference on it.
+ */
+ if (unlikely(!PageHead(page_head))) {
+ /* PageHead is cleared after PageTail */
+ smp_rmb();
+ VM_BUG_ON(PageTail(page));
+ goto out_put_head;
+ }
+ /*
+ * Only run compound_lock on a valid PageHead,
+ * after having it pinned with
+ * get_page_unless_zero() above.
+ */
+ smp_mb();
+ /* page_head wasn't a dangling pointer */
+ flags = compound_lock_irqsave(page_head);
+ if (unlikely(!PageTail(page))) {
+ /* __split_huge_page_refcount run before us */
+ compound_unlock_irqrestore(page_head, flags);
+ VM_BUG_ON(PageHead(page_head));
+ out_put_head:
+ if (put_page_testzero(page_head))
+ __put_single_page(page_head);
+ out_put_single:
+ if (put_page_testzero(page))
+ __put_single_page(page);
+ return;
+ }
+ VM_BUG_ON(page_head != page->first_page);
+ /*
+ * We can release the refcount taken by
+ * get_page_unless_zero now that
+ * split_huge_page_refcount is blocked on the
+ * compound_lock.
+ */
+ if (put_page_testzero(page_head))
+ VM_BUG_ON(1);
+ /* __split_huge_page_refcount will wait now */
+ VM_BUG_ON(atomic_read(&page->_count) <= 0);
+ atomic_dec(&page->_count);
+ VM_BUG_ON(atomic_read(&page_head->_count) <= 0);
+ compound_unlock_irqrestore(page_head, flags);
+ if (put_page_testzero(page_head))
+ __put_compound_page(page_head);
+ } else {
+ /* page_head is a dangling pointer */
+ VM_BUG_ON(PageTail(page));
+ goto out_put_single;
+ }
+ } else if (put_page_testzero(page)) {
+ if (PageHead(page))
+ __put_compound_page(page);
+ else
+ __put_single_page(page);
}
}
@@ -75,7 +151,7 @@ void put_page(struct page *page)
if (unlikely(PageCompound(page)))
put_compound_page(page);
else if (put_page_testzero(page))
- __page_cache_release(page);
+ __put_single_page(page);
}
EXPORT_SYMBOL(put_page);